Interwell electromagnetic logging system

Abstract

The invention relates to an interwell electromagnetic logging system, which comprises two parts including an emitting device and a receiving device, wherein the emitting device consists of an emitting circuit and an emitting coil, the receiving device consists of a receiving circuit, a receiving coil or a magnetic meter, the emitting circuit comprises a power supply, a communication circuit, an emitting control circuit, an emitting driving circuit and an emitting tuning circuit, the emitting coil comprises a resonance emitting coil and a monitoring coil, the receiving circuit comprises a power supply, a communication circuit, a receiving signal control and processing circuit and a receiving signal amplification circuit, the receiving coil comprises one or a plurality of receiving coils, and each receiving coil comprises a coil and a signal pre-amplification circuit. The interwell electromagnetic logging system has the advantages that the measurement of interwell resistivity with the open hole well space not smaller than 500mm and the metal sleeve pipe well space not smaller than 200m can be completed, the direct measurement and description on interwell region ground layer electric characteristics can be realized, the electric characteristic change of oil and water is distinguished for reflecting the reservoir layer characteristics, and the nonhomogeneity and the communication performance of the reservoir layer are determined.

Description

technical field [0001] The invention relates to the technical field of cross-well electromagnetic logging, in particular to a cross-well electromagnetic logging system which utilizes the propagation of electromagnetic waves between wells to reflect the resistivity distribution of inter-well formations. Background technique [0002] Conventional well logging technology is suitable for single well measurement, which can accurately reflect the formation information near the wellbore, but its detection depth is shallow, and it is difficult to reflect the regional formation information, especially the interwell formation information; seismic detection uses long-distance acoustic detection technology, although the detection range Large, but its resolution is low, the measurement information is sensitive to reservoir rocks, and cannot accurately reflect the type and distribution of fluids, so it is difficult to efficiently perform the current reservoir detection tasks. [0003] Cro...

AI Technical Summary

Problems solved by technology

[0004] After investigation, foreign countries are still in the preliminary exploration and research stage of this logging technology, and the related technology of cross-well electromagnetic logging has not been found in China.

Images